Hot temperatures coming on heels of monsoon moisture

Cooler but humid conditions with a slight chance of rain will linger in the Southland through Monday, however temperatures will begin creeping up Tuesday and continue to climb into mid-week, according to the National Weather Service.

The recent cooler temperatures and high humidity are due to "instability with monsoon moisture," he said.

The moist system entered the U.S. through the Gulf of California and made it's way over Arizona before visiting Southern California, Sukup said.

"It should start to warm up as we go through the week," he said. ""We'll see some more sunshine than we've seen in the past few days as that monsoon moisture leaves the area."

In the San Gabriel Valley, high temperatures in the mid- to upper-80s were predicted by Tuesday. Temperatures could reach 90 degrees by Wednesday, and into the mid-90s Thursday through Saturday, according to NWS forecasts.

Slightly higher temperatures are expected in the San Fernando Valley and Inland Empire, according to the NWS.

High temperatures in warmer San Fernando Valley communities such as Woodland Hills could reach 100 degrees Thursday through Saturday. Sukup said.

High temperatures at or very near 100 degrees were also predicted Thursday through Saturday in the Inland Empire, according to forecasts issued by the NWS's San Diego office.

Officials Sunday afternoon were still considering whether a flash flood warning would be issued for Monday in the mountain areas and the Antelope Valley ahead of Monday's possible rain.